The 104th Doble Survey on Transformer Oils
The 2011 Survey (Report No. 104) consisted of the analysis of 46 electrical insulating mineral oils. It included samples of 17 North American oils, 3 South American oils, 19 European oils and 7 from Asia. Testing of each of the 46 samples included in this survey was performed in accordance with the Doble Transformer Oil Purchase Specification (TOPS) as revised and approved, April 2008. A copy of this edition of TOPS is included with this report. The documents that comprise the Survey are valuable tools in assessing the quality of oils which you may be considering for use. It may also provide information on a supplier that you are not aware of or you may be considering for use in the future.
The 104th Survey report consists of four (4) documents including:
- A document that reports on the oils tested, compares the testing from this year to last year. It also contains refiners' comments and contact information.
- Summary sheets of the testing results for each oil so that easy comparisons can be made between products and refiners.
- Individual test result sheets that provide the results of all the testing performed on each oil, giving you the most comprehensive overview in the industry worldwide.
- The Doble TOPS specification to which these oils were tested.
Participating Refiners
Calumet Lubricants Co., USA
Cross Oil Refining & Marketing, Inc., USA
Ergon Refining Inc., USA
Imperial Oil Ltd., Canada
Petro-Canada Lubricants, Canada
San Joaquin Refining Co., USA
Tulstar Products Inc., USA
UniSource Energy Inc., USA
Lubricantes Venoco Internacional, Venezuela
Petrobras Distribuidora S/A, Brazil
MOL, Hungary
Nynas Naphthenics AB, Sweden
Repsol Lubricantes & Especialidades, Spain
Shell Global Solutions, Germany
Lubricant Company of PetroChina Co., China
Total Lubricants Taiwan Ltd., Taiwan
The survey consists of the following tests:
| Test |
Method |
| Aniline Point |
ASTM D611 |
| Color |
ASTM D1500 |
| Corrosive Sulfur |
ASTM D1275B |
| Dielectric Strength |
ASTM D877 |
| Dielectric Strength |
ASTM D1816 |
| Water |
ASTM D1533 |
| Flash Point |
ASTM D92 |
| Interfacial Tension |
ASTM D971 |
| Neutralization Number |
ASTM D974 |
| Pour Point |
ASTM D97 |
| Power Factor at 25°C |
ASTM D924 |
| Power Factor at 100°C |
ASTM D924 |
| Relative Density |
ASTM D1298 |
| Inhibitor Content |
ASTM D2668 |
| Viscosity at 0°C |
ASTM D445 |
| Viscosity at 40°C |
ASTM D445 |
| Viscosity at 100°C |
ASTM D445 |
| Sludge Free Life |
Doble |
| PFVO Oxidation Test |
Doble |
| Oxidation Stability |
ASTM D2440 |
| Rotating Pressure Vessel |
ASTM D2112 |
| Gassing Tendency |
ASTM D2300 |
| Impulse Breakdown |
ASTM D3300 |
| Carbon Type Composition |
ASTM D2140 |
| Polychlorinated Biphenyls |
ASTM D4059 |
| Doble CCD Test |
Doble |
| Furanic Compounds |
ASTM D5837 |
| Benzotriazole Content |
Doble |
| Irgamet 39 Content |
Doble |
The Survey can be purchased using a credit card or purchase order. For more information or to purchase the Survey please contact:
Lance Lewand
Doble Engineering Company
Materials Laboratory
85 Walnut Street
Watertown, MA 02472 USA
Phone: 1.617.393.2981
E-mail: llewand@doble.com
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